Research Center for Environmental Monitoring and Modeling, Hanoi, Ha Noi, Vietnam Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+
October Air Quality Analysis
Research Center for Environmental Monitoring and Modeling, Hanoi, Ha Noi, Vietnam
2022
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
28th Oct 2022
236AQILowest AQI recorded on
19th Oct 2024
22AQISame Day Analysis (30th October ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 2nd highest AQI at 141 of Poor air quality, showing improvement over 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 30th Oct - 31st Oct 2025
Research Center for Environmental Monitoring and Modeling, Hanoi, Ha Noi, Vietnam
AQI
Day
Night
.
5 AM30th Oct 2025
5 PM
4 AM31st Oct 2025
Day time
Avg. Highest Time
12AMNaNth undefined
AQI
Avg. Lowest Time
12AMNaNth undefined
AQI
Night time
Avg. Highest Time
7AM30th Oct
145AQI
Avg. Lowest Time
3AM31st Oct
57AQI
In the last 24 hours,
Research Center for Environmental Monitoring and Modeling's AQI reached its highest point of 145 at 7 AM during the Night, while the lowest point, 57, was recorded at 3 AM during the Night between 30th Oct and 31st Oct 2025.
Day & Night AQI Trend : Oct 2025
Research Center for Environmental Monitoring and Modeling, Hanoi, Ha Noi, Vietnam
Oct
01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st
Day
Night
1st Oct 2025715 AMAQI
1st Oct 2025646 AMAQI
1st Oct 2025667 AMAQI
1st Oct 2025628 AMAQI
1st Oct 2025589 AMAQI
1st Oct 20256210 AMAQI
1st Oct 20255411 AMAQI
1st Oct 20255112 PMAQI
1st Oct 2025491 PMAQI
1st Oct 2025542 PMAQI
1st Oct 2025553 PMAQI
1st Oct 2025614 PMAQI
1st Oct 2025685 PMAQI
1st Oct 2025666 PMAQI
1st Oct 2025647 PMAQI
1st Oct 2025668 PMAQI
1st Oct 2025719 PMAQI
1st Oct 20258710 PMAQI
1st Oct 20258411 PMAQI
2nd Oct 20257912 AMAQI
2nd Oct 2025801 AMAQI
2nd Oct 2025802 AMAQI
2nd Oct 2025963 AMAQI
2nd Oct 20251184 AMAQI
27°C24/30°C
2nd Oct 20251175 AMAQI
2nd Oct 2025866 AMAQI
2nd Oct 2025917 AMAQI
2nd Oct 2025998 AMAQI
2nd Oct 20251049 AMAQI
2nd Oct 20259210 AMAQI
2nd Oct 20258311 AMAQI
2nd Oct 20256412 PMAQI
2nd Oct 2025651 PMAQI
2nd Oct 2025632 PMAQI
2nd Oct 2025633 PMAQI
2nd Oct 2025584 PMAQI
2nd Oct 2025625 PMAQI
2nd Oct 2025596 PMAQI
2nd Oct 2025627 PMAQI
2nd Oct 2025608 PMAQI
2nd Oct 2025659 PMAQI
2nd Oct 20257810 PMAQI
2nd Oct 20257111 PMAQI
3rd Oct 20257212 AMAQI
3rd Oct 2025671 AMAQI
3rd Oct 2025642 AMAQI
3rd Oct 2025663 AMAQI
3rd Oct 2025704 AMAQI
27°C24/32°C
3rd Oct 2025775 AMAQI
3rd Oct 2025736 AMAQI
3rd Oct 2025687 AMAQI
3rd Oct 2025688 AMAQI
3rd Oct 2025669 AMAQI
3rd Oct 20257010 AMAQI
3rd Oct 20256611 AMAQI
3rd Oct 20256112 PMAQI
3rd Oct 2025641 PMAQI
3rd Oct 2025602 PMAQI
3rd Oct 2025573 PMAQI
3rd Oct 2025574 PMAQI
3rd Oct 2025585 PMAQI
3rd Oct 2025526 PMAQI
3rd Oct 2025717 PMAQI
3rd Oct 2025748 PMAQI
3rd Oct 2025829 PMAQI
3rd Oct 20258710 PMAQI
3rd Oct 20259511 PMAQI
4th Oct 20259012 AMAQI
4th Oct 2025911 AMAQI
4th Oct 2025882 AMAQI
4th Oct 2025833 AMAQI
4th Oct 2025824 AMAQI
28°C24/33°C
4th Oct 2025765 AMAQI
4th Oct 2025906 AMAQI
4th Oct 2025957 AMAQI
4th Oct 20251028 AMAQI
4th Oct 20251079 AMAQI
4th Oct 202511610 AMAQI
4th Oct 202510211 AMAQI
4th Oct 20259012 PMAQI
4th Oct 20251041 PMAQI
4th Oct 20251002 PMAQI
4th Oct 2025893 PMAQI
4th Oct 2025864 PMAQI
4th Oct 2025875 PMAQI
4th Oct 2025906 PMAQI
4th Oct 2025927 PMAQI
4th Oct 2025968 PMAQI
4th Oct 2025999 PMAQI
4th Oct 202511010 PMAQI
4th Oct 202511311 PMAQI
5th Oct 202511212 AMAQI
5th Oct 2025951 AMAQI
5th Oct 2025972 AMAQI
5th Oct 20251053 AMAQI
5th Oct 20251144 AMAQI
28°C24/32°C
5th Oct 20251255 AMAQI
5th Oct 20251436 AMAQI
5th Oct 20251527 AMAQI
5th Oct 20251428 AMAQI
5th Oct 20251399 AMAQI
5th Oct 202514210 AMAQI
5th Oct 202514211 AMAQI
5th Oct 202514412 PMAQI
5th Oct 20251351 PMAQI
5th Oct 20251162 PMAQI
5th Oct 20251023 PMAQI
5th Oct 20251034 PMAQI
5th Oct 2025985 PMAQI
5th Oct 2025996 PMAQI
5th Oct 2025997 PMAQI
5th Oct 20251138 PMAQI
5th Oct 20251269 PMAQI
5th Oct 202512810 PMAQI
5th Oct 202513211 PMAQI
6th Oct 202513612 AMAQI
6th Oct 20251451 AMAQI
6th Oct 20251522 AMAQI
6th Oct 20251533 AMAQI
6th Oct 20251534 AMAQI
29°C25/34°C
6th Oct 20251555 AMAQI
6th Oct 20251526 AMAQI
6th Oct 20251427 AMAQI
6th Oct 20251388 AMAQI
6th Oct 20251289 AMAQI
6th Oct 202512710 AMAQI
6th Oct 202511711 AMAQI
6th Oct 202511812 PMAQI
6th Oct 20251061 PMAQI
6th Oct 2025892 PMAQI
6th Oct 2025633 PMAQI
6th Oct 2025674 PMAQI
6th Oct 2025645 PMAQI
6th Oct 2025656 PMAQI
6th Oct 2025657 PMAQI
6th Oct 2025678 PMAQI
6th Oct 2025679 PMAQI
6th Oct 20256410 PMAQI
6th Oct 20256511 PMAQI
7th Oct 20256812 AMAQI
25°C24/27°C
7th Oct 2025706 PMAQI
7th Oct 2025577 PMAQI
7th Oct 2025618 PMAQI
7th Oct 2025649 PMAQI
7th Oct 20256310 PMAQI
7th Oct 20256911 PMAQI
8th Oct 20256812 AMAQI
8th Oct 2025651 AMAQI
8th Oct 2025632 AMAQI
8th Oct 2025623 AMAQI
8th Oct 2025654 AMAQI
25°C24/28°C
8th Oct 2025655 AMAQI
8th Oct 2025576 AMAQI
8th Oct 2025567 AMAQI
8th Oct 2025678 AMAQI
8th Oct 2025779 AMAQI
8th Oct 20257410 AMAQI
8th Oct 20257911 AMAQI
8th Oct 20257612 PMAQI
8th Oct 2025771 PMAQI
8th Oct 2025692 PMAQI
8th Oct 2025743 PMAQI
8th Oct 2025834 PMAQI
8th Oct 2025785 PMAQI
8th Oct 2025776 PMAQI
8th Oct 2025707 PMAQI
8th Oct 2025708 PMAQI
8th Oct 2025749 PMAQI
8th Oct 20257710 PMAQI
8th Oct 20257511 PMAQI
9th Oct 20258312 AMAQI
9th Oct 2025991 AMAQI
9th Oct 20251122 AMAQI
9th Oct 20251253 AMAQI
9th Oct 20251424 AMAQI
27°C24/32°C
9th Oct 20251315 AMAQI
9th Oct 20251166 AMAQI
9th Oct 20251187 AMAQI
9th Oct 20251318 AMAQI
9th Oct 20251499 AMAQI
9th Oct 202515210 AMAQI
9th Oct 202515011 AMAQI
9th Oct 202512612 PMAQI
9th Oct 20251031 PMAQI
9th Oct 2025942 PMAQI
9th Oct 2025983 PMAQI
9th Oct 20251034 PMAQI
9th Oct 20251055 PMAQI
9th Oct 20251046 PMAQI
9th Oct 20251007 PMAQI
9th Oct 20251028 PMAQI
9th Oct 20251239 PMAQI
9th Oct 202512610 PMAQI
9th Oct 202512011 PMAQI
10th Oct 202510812 AMAQI
10th Oct 20251051 AMAQI
10th Oct 20251122 AMAQI
10th Oct 20251183 AMAQI
10th Oct 20251244 AMAQI
27°C24/32°C
10th Oct 20251315 AMAQI
10th Oct 20251286 AMAQI
10th Oct 20251317 AMAQI
10th Oct 20251538 AMAQI
10th Oct 20251619 AMAQI
10th Oct 202516610 AMAQI
10th Oct 202516211 AMAQI
10th Oct 202513212 PMAQI
10th Oct 20251261 PMAQI
10th Oct 20251052 PMAQI
10th Oct 20251013 PMAQI
10th Oct 20251044 PMAQI
10th Oct 2025995 PMAQI
10th Oct 20251106 PMAQI
10th Oct 20251027 PMAQI
10th Oct 20251248 PMAQI
10th Oct 20251319 PMAQI
10th Oct 202513210 PMAQI
10th Oct 202514611 PMAQI
11th Oct 202513412 AMAQI
11th Oct 20251231 AMAQI
11th Oct 20251182 AMAQI
11th Oct 20251073 AMAQI
11th Oct 2025974 AMAQI
28°C24/33°C
11th Oct 20251005 AMAQI
11th Oct 2025896 AMAQI
11th Oct 2025987 AMAQI
11th Oct 20251148 AMAQI
11th Oct 20251399 AMAQI
11th Oct 202515610 AMAQI
11th Oct 202515111 AMAQI
11th Oct 202514612 PMAQI
11th Oct 20251171 PMAQI
11th Oct 20251212 PMAQI
11th Oct 2025973 PMAQI
11th Oct 2025864 PMAQI
11th Oct 2025865 PMAQI
11th Oct 20251006 PMAQI
11th Oct 20251007 PMAQI
11th Oct 20251028 PMAQI
11th Oct 20251209 PMAQI
11th Oct 202512210 PMAQI
11th Oct 202511811 PMAQI
12th Oct 202514212 AMAQI
12th Oct 20251341 AMAQI
12th Oct 20251352 AMAQI
12th Oct 20251313 AMAQI
12th Oct 20251344 AMAQI
28°C25/32°C
12th Oct 20251355 AMAQI
12th Oct 20251436 AMAQI
12th Oct 20251407 AMAQI
12th Oct 20251428 AMAQI
12th Oct 20251199 AMAQI
12th Oct 202510410 AMAQI
12th Oct 202512211 AMAQI
12th Oct 202512312 PMAQI
12th Oct 20251191 PMAQI
12th Oct 20251112 PMAQI
12th Oct 20251173 PMAQI
12th Oct 20251204 PMAQI
12th Oct 20251115 PMAQI
12th Oct 20251076 PMAQI
12th Oct 20251117 PMAQI
12th Oct 20251098 PMAQI
12th Oct 20251179 PMAQI
12th Oct 202510210 PMAQI
12th Oct 202510111 PMAQI
13th Oct 20258912 AMAQI
13th Oct 2025931 AMAQI
13th Oct 2025802 AMAQI
13th Oct 2025803 AMAQI
13th Oct 2025824 AMAQI
28°C25/32°C
13th Oct 2025775 AMAQI
13th Oct 2025756 AMAQI
13th Oct 2025817 AMAQI
13th Oct 2025988 AMAQI
13th Oct 20251059 AMAQI
13th Oct 202511010 AMAQI
13th Oct 202510811 AMAQI
13th Oct 202511312 PMAQI
13th Oct 20251081 PMAQI
13th Oct 2025922 PMAQI
13th Oct 2025713 PMAQI
13th Oct 2025754 PMAQI
13th Oct 2025695 PMAQI
13th Oct 2025616 PMAQI
13th Oct 2025597 PMAQI
13th Oct 2025628 PMAQI
13th Oct 2025699 PMAQI
13th Oct 20257410 PMAQI
13th Oct 20257411 PMAQI
14th Oct 20258112 AMAQI
14th Oct 2025771 AMAQI
14th Oct 2025762 AMAQI
14th Oct 2025813 AMAQI
14th Oct 2025824 AMAQI
27°C25/31°C
14th Oct 2025815 AMAQI
14th Oct 2025806 AMAQI
14th Oct 2025787 AMAQI
14th Oct 2025788 AMAQI
14th Oct 2025839 AMAQI
14th Oct 20258310 AMAQI
14th Oct 20257711 AMAQI
14th Oct 20257912 PMAQI
14th Oct 2025721 PMAQI
14th Oct 2025722 PMAQI
14th Oct 2025733 PMAQI
14th Oct 2025744 PMAQI
14th Oct 2025795 PMAQI
14th Oct 2025746 PMAQI
14th Oct 2025707 PMAQI
14th Oct 2025718 PMAQI
14th Oct 2025769 PMAQI
14th Oct 20258710 PMAQI
14th Oct 20257311 PMAQI
15th Oct 20257812 AMAQI
15th Oct 2025781 AMAQI
15th Oct 2025862 AMAQI
15th Oct 2025823 AMAQI
15th Oct 2025734 AMAQI
27°C25/30°C
15th Oct 2025715 AMAQI
15th Oct 2025706 AMAQI
15th Oct 2025757 AMAQI
15th Oct 2025758 AMAQI
15th Oct 2025789 AMAQI
15th Oct 20257910 AMAQI
15th Oct 20257511 AMAQI
15th Oct 20257712 PMAQI
15th Oct 2025761 PMAQI
15th Oct 2025662 PMAQI
15th Oct 2025653 PMAQI
15th Oct 2025664 PMAQI
15th Oct 2025615 PMAQI
15th Oct 2025676 PMAQI
15th Oct 2025627 PMAQI
15th Oct 2025628 PMAQI
15th Oct 2025749 PMAQI
15th Oct 20259410 PMAQI
15th Oct 20259111 PMAQI
16th Oct 202510612 AMAQI
16th Oct 20251051 AMAQI
16th Oct 20251002 AMAQI
16th Oct 20251323 AMAQI
16th Oct 20251284 AMAQI
27°C24/31°C
16th Oct 20251335 AMAQI
16th Oct 2025946 AMAQI
16th Oct 20251077 AMAQI
16th Oct 2025938 AMAQI
16th Oct 2025679 AMAQI
16th Oct 20256110 AMAQI
16th Oct 20256911 AMAQI
16th Oct 20258012 PMAQI
16th Oct 2025801 PMAQI
16th Oct 2025882 PMAQI
16th Oct 2025933 PMAQI
16th Oct 2025734 PMAQI
16th Oct 2025765 PMAQI
16th Oct 2025816 PMAQI
16th Oct 2025807 PMAQI
16th Oct 2025928 PMAQI
16th Oct 20251029 PMAQI
16th Oct 202510610 PMAQI
16th Oct 202511411 PMAQI
17th Oct 202510012 AMAQI
17th Oct 2025881 AMAQI
17th Oct 2025972 AMAQI
17th Oct 20251033 AMAQI
17th Oct 20251134 AMAQI
27°C24/31°C
17th Oct 20251175 AMAQI
17th Oct 20251386 AMAQI
17th Oct 20251477 AMAQI
17th Oct 20251518 AMAQI
17th Oct 20251419 AMAQI
17th Oct 202514310 AMAQI
17th Oct 202512011 AMAQI
17th Oct 20259112 PMAQI
17th Oct 2025941 PMAQI
17th Oct 2025832 PMAQI
17th Oct 2025793 PMAQI
17th Oct 2025824 PMAQI
17th Oct 2025815 PMAQI
17th Oct 2025826 PMAQI
17th Oct 2025857 PMAQI
17th Oct 2025918 PMAQI
17th Oct 2025989 PMAQI
17th Oct 20259810 PMAQI
17th Oct 20259411 PMAQI
18th Oct 20259212 AMAQI
18th Oct 2025881 AMAQI
18th Oct 2025912 AMAQI
18th Oct 2025933 AMAQI
18th Oct 20251244 AMAQI
27°C24/32°C
18th Oct 20251375 AMAQI
18th Oct 20251506 AMAQI
18th Oct 20251577 AMAQI
18th Oct 20251498 AMAQI
18th Oct 20251569 AMAQI
18th Oct 202515510 AMAQI
18th Oct 202514611 AMAQI
18th Oct 202513012 PMAQI
18th Oct 20251361 PMAQI
18th Oct 20251222 PMAQI
18th Oct 2025893 PMAQI
18th Oct 2025854 PMAQI
18th Oct 2025835 PMAQI
18th Oct 2025946 PMAQI
18th Oct 2025907 PMAQI
18th Oct 2025988 PMAQI
18th Oct 2025959 PMAQI
18th Oct 202510010 PMAQI
18th Oct 202511111 PMAQI
19th Oct 202512612 AMAQI
19th Oct 20251181 AMAQI
19th Oct 20251212 AMAQI
19th Oct 20251103 AMAQI
19th Oct 20251174 AMAQI
28°C24/33°C
19th Oct 20251435 AMAQI
19th Oct 20251506 AMAQI
19th Oct 20251437 AMAQI
19th Oct 20251368 AMAQI
19th Oct 20251489 AMAQI
19th Oct 202515510 AMAQI
19th Oct 202515611 AMAQI
19th Oct 202511512 PMAQI
19th Oct 20251221 PMAQI
19th Oct 20251022 PMAQI
19th Oct 20251003 PMAQI
19th Oct 2025924 PMAQI
19th Oct 2025935 PMAQI
19th Oct 2025976 PMAQI
19th Oct 2025877 PMAQI
19th Oct 20251008 PMAQI
19th Oct 20251109 PMAQI
19th Oct 202511110 PMAQI
19th Oct 202510811 PMAQI
20th Oct 202511212 AMAQI
20th Oct 20251111 AMAQI
20th Oct 20251072 AMAQI
20th Oct 2025993 AMAQI
20th Oct 20251024 AMAQI
28°C25/33°C
20th Oct 2025975 AMAQI
20th Oct 20251006 AMAQI
20th Oct 20251027 AMAQI
20th Oct 2025908 AMAQI
20th Oct 2025979 AMAQI
20th Oct 20258410 AMAQI
20th Oct 20257511 AMAQI
20th Oct 20257412 PMAQI
20th Oct 2025721 PMAQI
20th Oct 2025712 PMAQI
20th Oct 2025723 PMAQI
20th Oct 2025764 PMAQI
20th Oct 2025795 PMAQI
20th Oct 2025846 PMAQI
20th Oct 2025907 PMAQI
20th Oct 2025828 PMAQI
20th Oct 2025849 PMAQI
20th Oct 20258010 PMAQI
20th Oct 20258711 PMAQI
21st Oct 20257512 AMAQI
21st Oct 2025801 AMAQI
21st Oct 2025812 AMAQI
21st Oct 2025683 AMAQI
21st Oct 2025654 AMAQI
26°C23/30°C
21st Oct 2025725 AMAQI
21st Oct 2025646 AMAQI
21st Oct 2025607 AMAQI
21st Oct 2025578 AMAQI
21st Oct 2025599 AMAQI
21st Oct 20255710 AMAQI
21st Oct 20255711 AMAQI
21st Oct 20256812 PMAQI
21st Oct 2025591 PMAQI
21st Oct 2025562 PMAQI
21st Oct 2025563 PMAQI
21st Oct 2025564 PMAQI
21st Oct 2025545 PMAQI
21st Oct 2025566 PMAQI
21st Oct 2025627 PMAQI
21st Oct 2025708 PMAQI
21st Oct 2025679 PMAQI
21st Oct 20256510 PMAQI
21st Oct 20256111 PMAQI
22nd Oct 20255812 AMAQI
22nd Oct 2025581 AMAQI
22nd Oct 2025592 AMAQI
22nd Oct 2025613 AMAQI
22nd Oct 2025594 AMAQI
24°C21/28°C
22nd Oct 2025565 AMAQI
22nd Oct 2025556 AMAQI
22nd Oct 2025557 AMAQI
22nd Oct 2025548 AMAQI
22nd Oct 2025589 AMAQI
22nd Oct 20255510 AMAQI
22nd Oct 20255711 AMAQI
22nd Oct 20256212 PMAQI
22nd Oct 2025561 PMAQI
22nd Oct 2025592 PMAQI
22nd Oct 2025513 PMAQI
22nd Oct 2025534 PMAQI
22nd Oct 2025565 PMAQI
22nd Oct 2025556 PMAQI
22nd Oct 2025587 PMAQI
22nd Oct 2025648 PMAQI
22nd Oct 2025679 PMAQI
22nd Oct 20256610 PMAQI
22nd Oct 20256411 PMAQI
23rd Oct 20256412 AMAQI
23rd Oct 2025631 AMAQI
23rd Oct 2025662 AMAQI
23rd Oct 2025683 AMAQI
23rd Oct 2025534 AMAQI
22°C19/26°C
23rd Oct 2025545 AMAQI
23rd Oct 2025696 AMAQI
23rd Oct 2025707 AMAQI
23rd Oct 2025788 AMAQI
23rd Oct 2025609 AMAQI
23rd Oct 20256610 AMAQI
23rd Oct 20256611 AMAQI
23rd Oct 20256112 PMAQI
23rd Oct 2025591 PMAQI
23rd Oct 2025622 PMAQI
23rd Oct 2025623 PMAQI
23rd Oct 2025634 PMAQI
23rd Oct 2025635 PMAQI
23rd Oct 2025656 PMAQI
23rd Oct 2025647 PMAQI
23rd Oct 2025648 PMAQI
23rd Oct 2025689 PMAQI
23rd Oct 20257810 PMAQI
23rd Oct 20258111 PMAQI
24th Oct 20257712 AMAQI
24th Oct 2025741 AMAQI
24th Oct 2025722 AMAQI
24th Oct 2025733 AMAQI
24th Oct 2025794 AMAQI
19°C17/20°C
24th Oct 2025735 AMAQI
24th Oct 2025866 AMAQI
24th Oct 2025957 AMAQI
24th Oct 20251008 AMAQI
24th Oct 20251039 AMAQI
24th Oct 20258210 AMAQI
24th Oct 20257411 AMAQI
24th Oct 20256612 PMAQI
24th Oct 2025651 PMAQI
24th Oct 2025602 PMAQI
24th Oct 2025623 PMAQI
24th Oct 2025634 PMAQI
24th Oct 2025645 PMAQI
24th Oct 2025706 PMAQI
24th Oct 2025687 PMAQI
24th Oct 2025698 PMAQI
24th Oct 2025729 PMAQI
24th Oct 20256910 PMAQI
24th Oct 20258111 PMAQI
25th Oct 20259312 AMAQI
25th Oct 20251141 AMAQI
25th Oct 20251082 AMAQI
25th Oct 20251073 AMAQI
25th Oct 2025834 AMAQI
20°C18/22°C
25th Oct 2025885 AMAQI
25th Oct 2025916 AMAQI
25th Oct 2025857 AMAQI
25th Oct 2025858 AMAQI
25th Oct 2025819 AMAQI
25th Oct 20258410 AMAQI
25th Oct 20259411 AMAQI
25th Oct 20259012 PMAQI
25th Oct 2025861 PMAQI
25th Oct 2025872 PMAQI
25th Oct 2025863 PMAQI
25th Oct 2025894 PMAQI
25th Oct 2025915 PMAQI
25th Oct 2025986 PMAQI
25th Oct 20251117 PMAQI
25th Oct 2025938 PMAQI
25th Oct 20251099 PMAQI
25th Oct 202512410 PMAQI
25th Oct 202513711 PMAQI
26th Oct 202514712 AMAQI
26th Oct 20251501 AMAQI
26th Oct 20251392 AMAQI
26th Oct 20251323 AMAQI
26th Oct 20251234 AMAQI
22°C18/27°C
26th Oct 20251205 AMAQI
26th Oct 20251236 AMAQI
26th Oct 20251307 AMAQI
26th Oct 20251158 AMAQI
26th Oct 20251099 AMAQI
26th Oct 202510210 AMAQI
26th Oct 20259211 AMAQI
26th Oct 20258712 PMAQI
26th Oct 2025831 PMAQI
26th Oct 2025772 PMAQI
26th Oct 2025763 PMAQI
26th Oct 2025744 PMAQI
26th Oct 2025745 PMAQI
26th Oct 2025736 PMAQI
26th Oct 2025817 PMAQI
26th Oct 2025938 PMAQI
26th Oct 20251179 PMAQI
26th Oct 202512510 PMAQI
26th Oct 202510611 PMAQI
27th Oct 20259712 AMAQI
27th Oct 2025841 AMAQI
27th Oct 2025732 AMAQI
27th Oct 2025673 AMAQI
27th Oct 2025654 AMAQI
24°C22/28°C
27th Oct 2025705 AMAQI
27th Oct 2025696 AMAQI
27th Oct 2025687 AMAQI
27th Oct 2025668 AMAQI
27th Oct 2025679 AMAQI
27th Oct 20256710 AMAQI
27th Oct 20256711 AMAQI
27th Oct 20256612 PMAQI
27th Oct 2025661 PMAQI
27th Oct 2025632 PMAQI
27th Oct 2025623 PMAQI
27th Oct 2025634 PMAQI
27th Oct 2025645 PMAQI
27th Oct 2025636 PMAQI
27th Oct 2025657 PMAQI
27th Oct 2025768 PMAQI
27th Oct 2025899 PMAQI
27th Oct 20258910 PMAQI
27th Oct 202510211 PMAQI
28th Oct 202510312 AMAQI
28th Oct 20251191 AMAQI
28th Oct 20251352 AMAQI
28th Oct 20251263 AMAQI
28th Oct 20251544 AMAQI
24°C22/27°C
28th Oct 20251205 AMAQI
28th Oct 20251106 AMAQI
28th Oct 20251077 AMAQI
28th Oct 2025988 AMAQI
28th Oct 2025969 AMAQI
28th Oct 20259410 AMAQI
28th Oct 20258611 AMAQI
28th Oct 20259012 PMAQI
28th Oct 2025841 PMAQI
28th Oct 2025762 PMAQI
28th Oct 2025723 PMAQI
28th Oct 2025734 PMAQI
28th Oct 2025735 PMAQI
28th Oct 2025736 PMAQI
28th Oct 2025777 PMAQI
28th Oct 2025788 PMAQI
28th Oct 2025799 PMAQI
28th Oct 20259610 PMAQI
28th Oct 202514711 PMAQI
29th Oct 202515612 AMAQI
29th Oct 20251491 AMAQI
29th Oct 20251362 AMAQI
29th Oct 20251383 AMAQI
29th Oct 20251414 AMAQI
24°C22/28°C
29th Oct 20251555 AMAQI
29th Oct 20251526 AMAQI
29th Oct 20251457 AMAQI
29th Oct 20251388 AMAQI
29th Oct 20251429 AMAQI
29th Oct 202513210 AMAQI
29th Oct 202512611 AMAQI
29th Oct 202511012 PMAQI
29th Oct 2025971 PMAQI
29th Oct 2025902 PMAQI
29th Oct 2025863 PMAQI
29th Oct 2025864 PMAQI
29th Oct 2025965 PMAQI
29th Oct 20251106 PMAQI
29th Oct 20251297 PMAQI
29th Oct 20251248 PMAQI
29th Oct 20251249 PMAQI
29th Oct 202513510 PMAQI
29th Oct 202516111 PMAQI
30th Oct 202515912 AMAQI
30th Oct 20251551 AMAQI
30th Oct 20251462 AMAQI
30th Oct 20251413 AMAQI
30th Oct 20251454 AMAQI
24°C22/28°C
30th Oct 20251425 AMAQI
30th Oct 20251446 AMAQI
30th Oct 20251457 AMAQI
30th Oct 20251228 AMAQI
30th Oct 20251119 AMAQI
30th Oct 202511010 AMAQI
30th Oct 20259811 AMAQI
30th Oct 20259212 PMAQI
30th Oct 2025951 PMAQI
30th Oct 2025832 PMAQI
30th Oct 2025793 PMAQI
30th Oct 2025784 PMAQI
30th Oct 2025805 PMAQI
30th Oct 2025746 PMAQI
30th Oct 2025817 PMAQI
30th Oct 2025758 PMAQI
30th Oct 2025819 PMAQI
30th Oct 20257010 PMAQI
30th Oct 20257011 PMAQI
31st Oct 20256612 AMAQI
31st Oct 2025701 AMAQI
31st Oct 2025672 AMAQI
31st Oct 2025573 AMAQI
31st Oct 2025584 AMAQI
--°C/°C
31st Oct 2025605 AMAQI
5 AM31st Oct 2025566 AMAQI
11 AM
5 PM
11 PM
4 AM
--°C/°C
Day time
Avg. Highest Time
5 AM - 10 AM
103AQI
6 hours / Day
180 hours / Month
Avg. Lowest Time
3 PM - 5 PM
78AQI
3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 10 AM (Avg. 103), while the lowest AQI was between 3 PM to 5 PM (Avg. 78).
Night time
Avg. Highest Time
12 AM - 4 AM
98AQI
5 hours / Day
150 hours / Month
Avg. Lowest Time
6 PM - 7 PM
80AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 4 AM (Avg. 98), while the lowest AQI was between 6 PM to 7 PM (Avg. 80).
2025 Days Vs Air Quality
Research Center for Environmental Monitoring and Modeling, Hanoi, Ha Noi, Vietnam
2025
13%
39
59%
180
24%
72
4%
12
Total number of days with different AQI categories in last 303 days in 2025 (62 days remaining)
Good
39 DaysModerate
180 DaysPoor
72 DaysUnhealthy
12 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 13%
Health Risk Level:
Extreme
In 2025, 13% of 303 days were within WHO’s safe air quality limits. The risk of health issues is Extreme, potentially causing respiratory problems, heart disease, skin issues, and stress, especially for children, the elderly, and those with pre-existing conditions.
Annual Air Quality Insights
Research Center for Environmental Monitoring and Modeling, Hanoi, Ha Noi, Vietnam
AQI levels in 2025
AQI
PM2.5
PM10
CO
SO2
NO2
O3
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
137AQI
137AQI
2nd January 2025
184AQI
184AQI
3rd January 2025
133AQI
133AQI
4th January 2025
101AQI
101AQI
5th January 2025
104AQI
104AQI
6th January 2025
106AQI
106AQI
7th January 2025
133AQI
133AQI
8th January 2025
144AQI
144AQI
9th January 2025
153AQI
153AQI
10th January 2025
108AQI
108AQI
11th January 2025
116AQI
116AQI
12th January 2025
130AQI
130AQI
13th January 2025
149AQI
149AQI
14th January 2025
155AQI
155AQI
15th January 2025
154AQI
154AQI
16th January 2025
152AQI
152AQI
17th January 2025
158AQI
158AQI
18th January 2025
172AQI
172AQI
19th January 2025
167AQI
167AQI
20th January 2025
182AQI
182AQI
21st January 2025
165AQI
165AQI
22nd January 2025
163AQI
163AQI
23rd January 2025
148AQI
148AQI
24th January 2025
139AQI
139AQI
25th January 2025
115AQI
115AQI
26th January 2025
77AQI
77AQI
27th January 2025
101AQI
101AQI
28th January 2025
89AQI
89AQI
29th January 2025
123AQI
123AQI
30th January 2025
116AQI
116AQI
31st January 2025
99AQI
99AQI
1st February 2025
91AQI
91AQI
2nd February 2025
79AQI
79AQI
3rd February 2025
61AQI
61AQI
4th February 2025
77AQI
77AQI
5th February 2025
105AQI
105AQI
6th February 2025
110AQI
110AQI
7th February 2025
55AQI
55AQI
8th February 2025
71AQI
71AQI
9th February 2025
96AQI
96AQI
10th February 2025
142AQI
142AQI
11th February 2025
150AQI
150AQI
12th February 2025
166AQI
166AQI
13th February 2025
144AQI
144AQI
14th February 2025
141AQI
141AQI
15th February 2025
149AQI
149AQI
16th February 2025
82AQI
82AQI
17th February 2025
122AQI
122AQI
18th February 2025
72AQI
72AQI
19th February 2025
100AQI
100AQI
20th February 2025
139AQI
139AQI
21st February 2025
121AQI
121AQI
22nd February 2025
142AQI
142AQI
23rd February 2025
70AQI
70AQI
24th February 2025
82AQI
82AQI
25th February 2025
97AQI
97AQI
26th February 2025
90AQI
90AQI
27th February 2025
141AQI
141AQI
28th February 2025
107AQI
107AQI
1st March 2025
116AQI
116AQI
2nd March 2025
90AQI
90AQI
3rd March 2025
93AQI
93AQI
4th March 2025
96AQI
96AQI
5th March 2025
97AQI
97AQI
6th March 2025
72AQI
72AQI
7th March 2025
82AQI
82AQI
8th March 2025
105AQI
105AQI
9th March 2025
133AQI
133AQI
10th March 2025
144AQI
144AQI
11th March 2025
125AQI
125AQI
12th March 2025
100AQI
100AQI
13th March 2025
88AQI
88AQI
14th March 2025
94AQI
94AQI
15th March 2025
85AQI
85AQI
16th March 2025
66AQI
66AQI
17th March 2025
85AQI
85AQI
18th March 2025
90AQI
90AQI
19th March 2025
85AQI
85AQI
20th March 2025
95AQI
95AQI
21st March 2025
124AQI
124AQI
22nd March 2025
122AQI
122AQI
23rd March 2025
129AQI
129AQI
24th March 2025
138AQI
138AQI
25th March 2025
137AQI
137AQI
26th March 2025
119AQI
119AQI
27th March 2025
111AQI
111AQI
28th March 2025
113AQI
113AQI
29th March 2025
82AQI
82AQI
30th March 2025
67AQI
67AQI
31st March 2025
77AQI
77AQI
1st April 2025
102AQI
102AQI
2nd April 2025
136AQI
136AQI
3rd April 2025
113AQI
113AQI
4th April 2025
145AQI
145AQI
5th April 2025
122AQI
122AQI
6th April 2025
133AQI
133AQI
7th April 2025
128AQI
128AQI
8th April 2025
121AQI
121AQI
9th April 2025
97AQI
97AQI
10th April 2025
101AQI
101AQI
11th April 2025
101AQI
101AQI
12th April 2025
106AQI
106AQI
13th April 2025
95AQI
95AQI
14th April 2025
103AQI
103AQI
15th April 2025
106AQI
106AQI
16th April 2025
110AQI
110AQI
17th April 2025
102AQI
102AQI
18th April 2025
107AQI
107AQI
19th April 2025
100AQI
100AQI
20th April 2025
89AQI
89AQI
21st April 2025
89AQI
89AQI
22nd April 2025
98AQI
98AQI
23rd April 2025
104AQI
104AQI
24th April 2025
91AQI
91AQI
25th April 2025
86AQI
86AQI
26th April 2025
83AQI
83AQI
27th April 2025
72AQI
72AQI
28th April 2025
69AQI
69AQI
29th April 2025
81AQI
81AQI
30th April 2025
76AQI
76AQI
1st May 2025
64AQI
64AQI
2nd May 2025
87AQI
87AQI
3rd May 2025
82AQI
82AQI
4th May 2025
80AQI
80AQI
5th May 2025
83AQI
83AQI
6th May 2025
78AQI
78AQI
7th May 2025
79AQI
79AQI
8th May 2025
81AQI
81AQI
9th May 2025
83AQI
83AQI
10th May 2025
85AQI
85AQI
11th May 2025
57AQI
57AQI
12th May 2025
72AQI
72AQI
13th May 2025
70AQI
70AQI
14th May 2025
66AQI
66AQI
15th May 2025
61AQI
61AQI
16th May 2025
62AQI
62AQI
17th May 2025
57AQI
57AQI
18th May 2025
57AQI
57AQI
19th May 2025
58AQI
58AQI
20th May 2025
59AQI
59AQI
21st May 2025
58AQI
58AQI
22nd May 2025
58AQI
58AQI
23rd May 2025
56AQI
56AQI
24th May 2025
55AQI
55AQI
25th May 2025
56AQI
56AQI
26th May 2025
61AQI
61AQI
27th May 2025
82AQI
82AQI
28th May 2025
79AQI
79AQI
29th May 2025
61AQI
61AQI
30th May 2025
60AQI
60AQI
31st May 2025
60AQI
60AQI
1st June 2025
53AQI
53AQI
2nd June 2025
55AQI
55AQI
3rd June 2025
55AQI
55AQI
4th June 2025
61AQI
61AQI
5th June 2025
73AQI
73AQI
6th June 2025
61AQI
61AQI
7th June 2025
60AQI
60AQI
8th June 2025
60AQI
60AQI
9th June 2025
66AQI
66AQI
10th June 2025
62AQI
62AQI
11th June 2025
64AQI
64AQI
12th June 2025
63AQI
63AQI
13th June 2025
57AQI
57AQI
14th June 2025
64AQI
64AQI
15th June 2025
80AQI
80AQI
16th June 2025
65AQI
65AQI
17th June 2025
63AQI
63AQI
18th June 2025
56AQI
56AQI
19th June 2025
68AQI
68AQI
20th June 2025
74AQI
74AQI
21st June 2025
68AQI
68AQI
22nd June 2025
65AQI
65AQI
23rd June 2025
65AQI
65AQI
24th June 2025
70AQI
70AQI
25th June 2025
61AQI
61AQI
26th June 2025
60AQI
60AQI
27th June 2025
61AQI
61AQI
28th June 2025
56AQI
56AQI
29th June 2025
58AQI
58AQI
30th June 2025
55AQI
55AQI
1st July 2025
50AQI
50AQI
2nd July 2025
50AQI
50AQI
3rd July 2025
57AQI
57AQI
4th July 2025
64AQI
64AQI
5th July 2025
64AQI
64AQI
6th July 2025
58AQI
58AQI
7th July 2025
65AQI
65AQI
8th July 2025
63AQI
63AQI
9th July 2025
71AQI
71AQI
10th July 2025
61AQI
61AQI
11th July 2025
58AQI
58AQI
12th July 2025
56AQI
56AQI
13th July 2025
58AQI
58AQI
14th July 2025
72AQI
72AQI
15th July 2025
82AQI
82AQI
16th July 2025
65AQI
65AQI
17th July 2025
62AQI
62AQI
18th July 2025
63AQI
63AQI
19th July 2025
74AQI
74AQI
20th July 2025
62AQI
62AQI
21st July 2025
61AQI
61AQI
22nd July 2025
46AQI
46AQI
23rd July 2025
49AQI
49AQI
24th July 2025
51AQI
51AQI
25th July 2025
59AQI
59AQI
26th July 2025
63AQI
63AQI
27th July 2025
61AQI
61AQI
28th July 2025
67AQI
67AQI
29th July 2025
75AQI
75AQI
30th July 2025
69AQI
69AQI
31st July 2025
61AQI
61AQI
1st August 2025
53AQI
53AQI
2nd August 2025
55AQI
55AQI
3rd August 2025
56AQI
56AQI
4th August 2025
56AQI
56AQI
5th August 2025
55AQI
55AQI
6th August 2025
54AQI
54AQI
7th August 2025
57AQI
57AQI
8th August 2025
58AQI
58AQI
9th August 2025
55AQI
55AQI
10th August 2025
57AQI
57AQI
11th August 2025
56AQI
56AQI
12th August 2025
51AQI
51AQI
13th August 2025
53AQI
53AQI
14th August 2025
54AQI
54AQI
15th August 2025
46AQI
46AQI
16th August 2025
44AQI
44AQI
17th August 2025
40AQI
40AQI
18th August 2025
40AQI
40AQI
19th August 2025
42AQI
42AQI
20th August 2025
43AQI
43AQI
21st August 2025
46AQI
46AQI
22nd August 2025
46AQI
46AQI
23rd August 2025
47AQI
47AQI
24th August 2025
46AQI
46AQI
25th August 2025
37AQI
37AQI
26th August 2025
34AQI
34AQI
27th August 2025
40AQI
40AQI
28th August 2025
45AQI
45AQI
29th August 2025
45AQI
45AQI
30th August 2025
40AQI
40AQI
31st August 2025
41AQI
41AQI
1st September 2025
41AQI
41AQI
2nd September 2025
42AQI
42AQI
3rd September 2025
41AQI
41AQI
4th September 2025
48AQI
48AQI
5th September 2025
42AQI
42AQI
6th September 2025
41AQI
41AQI
7th September 2025
50AQI
50AQI
8th September 2025
57AQI
57AQI
9th September 2025
52AQI
52AQI
10th September 2025
52AQI
52AQI
11th September 2025
45AQI
45AQI
12th September 2025
43AQI
43AQI
13th September 2025
41AQI
41AQI
14th September 2025
42AQI
42AQI
15th September 2025
46AQI
46AQI
16th September 2025
49AQI
49AQI
17th September 2025
49AQI
49AQI
18th September 2025
52AQI
52AQI
19th September 2025
57AQI
57AQI
20th September 2025
62AQI
62AQI
21st September 2025
70AQI
70AQI
22nd September 2025
61AQI
61AQI
23rd September 2025
63AQI
63AQI
24th September 2025
58AQI
58AQI
25th September 2025
53AQI
53AQI
26th September 2025
54AQI
54AQI
27th September 2025
48AQI
48AQI
28th September 2025
49AQI
49AQI
29th September 2025
39AQI
39AQI
30th September 2025
35AQI
35AQI
1st October 2025
59AQI
59AQI
2nd October 2025
78AQI
78AQI
3rd October 2025
70AQI
70AQI
4th October 2025
94AQI
94AQI
5th October 2025
121AQI
121AQI
6th October 2025
116AQI
116AQI
7th October 2025
64AQI
64AQI
8th October 2025
70AQI
70AQI
9th October 2025
110AQI
110AQI
10th October 2025
121AQI
121AQI
11th October 2025
118AQI
118AQI
12th October 2025
126AQI
126AQI
13th October 2025
82AQI
82AQI
14th October 2025
78AQI
78AQI
15th October 2025
75AQI
75AQI
16th October 2025
97AQI
97AQI
17th October 2025
103AQI
103AQI
18th October 2025
110AQI
110AQI
19th October 2025
119AQI
119AQI
20th October 2025
93AQI
93AQI
21st October 2025
66AQI
66AQI
22nd October 2025
59AQI
59AQI
23rd October 2025
65AQI
65AQI
24th October 2025
75AQI
75AQI
25th October 2025
97AQI
97AQI
26th October 2025
113AQI
113AQI
27th October 2025
77AQI
77AQI
28th October 2025
100AQI
100AQI
29th October 2025
134AQI
134AQI
30th October 2025
141AQI
141AQI
31st October 2025
1st November 2025
2nd November 2025
3rd November 2025
4th November 2025
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
10th November 2025
11th November 2025
12th November 2025
13th November 2025
14th November 2025
15th November 2025
16th November 2025
17th November 2025
18th November 2025
19th November 2025
20th November 2025
21st November 2025
22nd November 2025
23rd November 2025
24th November 2025
25th November 2025
26th November 2025
27th November 2025
28th November 2025
29th November 2025
30th November 2025
1st December 2025
2nd December 2025
3rd December 2025
4th December 2025
5th December 2025
6th December 2025
7th December 2025
8th December 2025
9th December 2025
10th December 2025
11th December 2025
12th December 2025
13th December 2025
14th December 2025
15th December 2025
16th December 2025
17th December 2025
18th December 2025
19th December 2025
20th December 2025
21st December 2025
22nd December 2025
23rd December 2025
24th December 2025
25th December 2025
26th December 2025
27th December 2025
28th December 2025
29th December 2025
30th December 2025
31st December 2025
135AQI
107AQI
102AQI
102AQI
68AQI
63AQI
62AQI
48AQI
49AQI
94AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202583AQI
3
17
11
14
13
1
18
13
13
17
31
30
4
27
17
14
18
12
18
12
39
180
72
12
Highest AQI recorded in
January135AQI
Lowest AQI recorded in
August48AQI
202468AQI
1
3
8
5
1
2
2
10
30
8
23
29
1
3
6
6
1
1
25
4
19
10
2
51
119
23
7
Highest AQI recorded in
January123AQI
Lowest AQI recorded in
September38AQI
2023127AQI
4
17
10
14
14
2
10
12
1
4
16
10
12
16
3
19
10
1
22
9
5
6
2
3
14
12
5
78
100
64
11
Highest AQI recorded in
January188AQI
Lowest AQI recorded in
July87AQI
2022178AQI
1
3
7
14
2
1
17
7
9
31
12
Highest AQI recorded in
October191AQI
Lowest AQI recorded in
November164AQI
Most & Least Polluted Years Over the Last 4 Years
Most Polluted Year Recorded
2022(Avg.)
178AQILeast Polluted Year Recorded
2024(Avg.)
68AQIResearch Center for Environmental Monitoring and Modeling's annual 2025 AQI (83) shows an average percentage change of -21.8% (improved AQI) compared to previous years: 2022 (178), 2023 (127), 2024 (68).
